<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>

    <div id="app">
        <li v-for="(f,index) in arr" :key="index"><input type="checkbox">{{f}}</li>

        <button @click="add">点击添加</button>
    </div>
    <script src="https://cdn.bootcdn.net/ajax/libs/vue/2.6.14/vue.js"></script>
    <script>
        let vm = new Vue({
            el:'#app',
            data:{
                arr:['香蕉','苹果','橘子']
            },
            methods:{
                add(){
                    this.arr.unshift('橙子')
                }
            }
        })
    </script>
</body>
</html>